Cytat
window.scroll()
Scrolls the window to a particular place in the document.
window.scrollBy()
Scrolls the document in the window by the given amount.
window.scrollByLines()
Scrolls the document by the given number of lines.
window.scrollByPages()
Scrolls the current document by the specified number of pages.
window.scrollTo()
Scrolls to a particular set of coordinates in the document.
EDIT: link by sie przydal
http://www.mozilla.org/docs/dom/domref/dom...ef.html#1011624w twoim przypadku: window.scrollBy()